On 12.5 mg metoprolol er for benign pvcs and cardio wants me to add 30 mg diltiziam 2x a day. im afraid to add this drug. is it safe? my pvc burden as of december was 1.7% and i can tell its much lower now in the metoprolol. need advice?

Discuss with your Cardio. Ask to discuss with you the risks and benefits of adding this so you can decide what is best for you. Only you can assess these properly in you own mind with Drs help.

Both those meds have negative chronotropic effects,which depress the heart rate and the combination can cause excessive slowing of the heart rate and lowering of blood pressure. Both also have negative ionotropic effects which weaken heart muscle contractions resulting in fatigue. However those are low doses of both meds& you may have no problems taking the combination. (I consider 10% high burden